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9144253362
-
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note
-
Near the beginning of the SIFT reaction flow tube (20-30 cm), the ion/He flow is turbulent. Further downstream, the ion/He flow becomes laminar. Injecting the radical/He pulse into the turbulent region causes the mixing of the radicals and the ions to be relatively fast.
-
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36
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9244241463
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9144232036
-
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note
-
In fact, the packet (or ion/radical reaction zone) is not plug shaped, since the initial section of the reaction flow tube is characterized by turbulent flow. Downstream, the packet shape will be affected by the parabolic velocity profile of the laminar He flow. The exact shape and volume of the packet is difficult to calculate.
-
-
-
-
40
-
-
9144246387
-
-
note
-
nd law of diffusion to calculate the diffusion distance for the radicals in the packet (see F. M. White, Heat and Mass Transfer; Chapter 11 and Appendices L and M). After the 10 ms transit time, the packet has expanded by about 3 cm in length. The loss of inert radicals (such as allyl) at the wall following radial diffusion will be small.
-
-
-
-
42
-
-
9144223246
-
-
note
-
Increasing the duty cycle will increase the product ion signal intensity. An increased duty cycle requires an increase in the repetition rate of the pulsed valve for the nozzle. However, since at high nozzle temperatures the pulse width becomes unstable when the frequency of the pulsed valve is high, we used the repetition rate of 20-40 Hz in our experiment to have a stable pulse width. Improving the stability of the pulse width at high frequency is in progress.
-
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43
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Upschulte, B. L.; Shul, R. J.; Passarella, R.; Keesee, R. G.; Castleman, A. W., Jr. Int. J. Mass Spectrom. Ion Processes 1987, 75, 27. The initial section of the flow tube (20-30 cm in length) is actually turbulent flow. However, the total reaction time will not be significantly affected by this short section.
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49
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9144262598
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0001983968
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9144262597
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5COOH + HCl.
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63
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in preparation
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Kato, S. et al., in preparation.
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